Diesel coolant color11/19/2023 ![]() They do not have 2-EHA but use other organic acids and add a little silicate. Group 3 - the group of hybrid OAT coolants called G-05. Five years, or 150,000-mile intervals are often recommended in this group of coolants. The corrosion inhibitors in this group are slower acting, but longer lasting. Honda has one coolant dyed a dark green, which looks almost black when it is dirty. Volkswagen-Audi has the same formula, but it is pink. General Motor’s OAT-based DexCool is orange. This formula gives longer life, thus replacing the short-lived silicates and phosphates. ![]() They contain 2-ethylhexanoic-acid or 2-EHA and other organic acids, but no silicates or phosphates. Group 2 – coolants based on the organic acid technology (OAT). If the customer fails to perform this maintenance, then expensive radiator, heater core and pump replacements soon follow. The corrosion inhibitors have a very short life and the antifreeze must be changed every other year or every 30,000 miles. This familiar green liquid has proven its worth in all the temperature extremes of North America. They have quick-acting silicate and phosphate corrosion inhibitors that do a good job inhibiting corrosion on both iron and aluminum surfaces. Group 1 - the original glycol-based “green” antifreeze we are all familiar with. GM had a major issue with the head gaskets being eaten up by one type of long life antifreeze, so they made a switch. Many automobile companies have switched from one Group to another, usually because of the number of years before flushing the system. In an Emergency, use the best water that is handy, preferably distilled or deionized water, why keep antifreeze on the shelf ? ![]() at the dealership look at the antifreeze jugs & see what is written on the jugs label Think about this & when you walk into the Parts Dept.
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